Nodulação natural e crescimento inicial de Clitoria fairchildiana em substratos orgânicos

Abstract

Strategies to reduce CO2 emissions for, as well as carbon sequestration, have already been widely disseminated in the literature and society. Among the alternatives for CO2 sequestration in production systems, the cultivation of forest species, both in urban and rural areas, can contribute significantly. In this context, the objective of this study is to evaluate the effect of the interaction between types and proportions of organic compounds for the regional substrate composition most suitable for the cultivation of Clitoria fairchildiana. The experiment was installed in a greenhouse at the Federal University of Recôncavo da Bahia (UFRB), Center for Agrarian, Environmental and Biological Sciences (CCAAB), in the municipality of Cruz das Almas – BA. The treatments were arranged in a completely randomized design in a 2 x 5 factorial arrangement, consisting of two types of organic compounds [COP (tree pruning) and CLU (urban waste)] and five soil proportions: organic compound (100:0, 80:20, 60:40, 40:60, 20:80, v:v), with 5 replications, totaling 50 experimental units. At 90 days after sowing, the variables analyzed were height (H), stem diameter (DC), leaf number (NF) and root length (CR), with the aid of a precision pachymeter of 0.01mm and ruler graduated in centimeters. The seedlings were segmented in roots and aerial parts, dried in a forced circulation air oven at 65°C until reaching constant weight, and measured the dry mass of the aerial part (MSPA), dry mass of roots (MSR), total dry mass (MST) and their relationship between shoot dry mass (H/MSPA) and shoot dry matter and root dry mass (MSPA/MSR) and Dickson Quality Index (IQD). Substrates constituted by proportions of organic compost from tree prunings plus cattle manure and goat or urban waste compost added to Latossolo did not have an effect on the initial growth of Clitoria fairchildiana. The addition of urban waste compost and organic compost from tree prunings plus bovine and goat manure to compose soil grown cultivation substrates reduces the natural nodulation of the Clitoria fairchildiana seedlings. The substrate indicated for the initial growth of Clitoria fairchildiana seedlings may consist only of yellow Latosol.